<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
width="0.23622in" height="0.23622in" viewBox="0 0 17.0079 17.0079" xml:space="preserve" color-interpolation-filters="sRGB"
class="_st3">
<style type="text/css">
<![CDATA[
._st1 {fill:#7f7f7f;stroke:#595959;stroke-linecap:round;stroke-linejoin:round;stroke-width:0.75}
._st2 {fill:#595959;font-family:Calibri;font-size:0.833336em}
._st3 {fill:none;fill-rule:evenodd;font-size:12px;overflow:visible;stroke-linecap:square;stroke-miterlimit:3}
]]>
</style>
<g>
<g id="shape1-1">
<rect x="0" y="0" width="17.0079" height="17.0079" class="_st1"/>
<text x="6.19" y="11.5" class="_st2">?</text>
</g>
</g>
</svg>
<script>
var svg = document.querySelector('svg');
svg.outerHTML = svg.outerHTML.replace(/_st/g,'_sv');
</script>
В DOM уже нет CDATA